Reduced-impact-and-recoil headrest

ABSTRACT

A reduced-impact-and-recoil headrest that includes a ratchet mechanism, allowing components to incrementally translate with respect to each other. The reduced-impact-and-recoil headrest includes an exterior housing surface that is deformable, providing cushioning for a vehicle occupant&#39;s head. The headrest also includes an interior compartment within the housing, with the ratchet mechanism disposed within the interior compartment. The headrest is configured to decrease the force of a collision experienced by the occupant, thereby decreasing the likelihood and severity of traumatic brain injuries resulting from the occupant&#39;s head striking a stationary headrest. Instead, the reduced-impact-and-recoil headrest is configured to incrementally move with the occupant&#39;s head, providing an incremental cushion for the occupant&#39;s head. The ratchet mechanism also prevents the reduced-impact-and-recoil headrest from automatically translating back to its pre-impact position, thereby decreasing the occupant&#39;s risk of ligament tear and whiplash.

BACKGROUND OF THE INVENTION 1. Field of the Invention

This invention relates, generally, to a reduced-impact-and-recoil headrest. More specifically, it relates to a headrest that includes a ratchet mechanism, whereby the ratchet mechanism allows the headrest to cushion an occupant's head and prevents the occupant's head from springing toward a front end of a vehicle during a collision.

2. Brief Description of the Prior Art

Automotive accidents represent a leading cause of death and injury, both worldwide and in the United States. Safety measures exist to prevent injuries in the event of a collision, such as the use of seatbelts, airbags, and headrests. Despite these safety measures, thousands of people die in automotive accidents each year, with millions more obtaining injuries as a result of collisions. The frequency and severity of automotive accidents results in billions of dollars spent each year on insurance, treatments, and repair. [1].

Some of the most severe injuries sustained during an automotive accident are traumatic brain injuries (TBIs), such as a concussion, hematoma, contusion, whiplash, and skull fracture. TBIs are some of the most dangerous injuries that can occur, often leading to death or long-term injury. TBIs occur due to an occupants' brain contacting the skull in the event of an extreme force, which can cause bruising or bleeding of the brain. For example, during an automotive accident, the occupant's head could forcefully collide with the steering wheel of the automobile. Alternatively, the occupant's head could be forced backward, colliding with a headrest on a seat. While the headrest is often cushioned to some degree, the force of the collision and the stationary nature of the headrest can lead to a severe TBI.

Attempts have been made to introduce headrests that can detect and respond to a collision, decreasing the occupant's risk of TBI. U.S. Pat. No. 8,052,211 discloses an active headrest that is actuated to translate toward an occupant in the event of a collision. Similarly, U.S. Pat. No. 7,926,871 discloses a moveable headrest that that adjusts a two-point support system in the event of a collision. Support is shifted between two areas, depending on the impact of the collision and the location of the occupant's head. While both the '211 patent and the '871 patent disclose improvements on traditional headrests, the references rely on the movement of the headrest in relation to the occupant's head. As a result, the references inherently rely on sensors and other electronic components to control the headrest's movement. In the event of a sensor failure, the headrests would function similar to traditional headrests, losing the disclosed improvements. Moreover, the headrests do not cushion the occupant's head in the event of a collision; instead, the headrests remain stationary when receiving the occupant's head, thereby failing to gently cushion the head during the collision. Finally, the headrests do not reduce the recoil of the occupant's head toward the front end of the vehicle; instead, the occupant's head typically springs forward, which can lead to ligament tears and whiplash.

Accordingly, what is needed is a reduced-impact-and-recoil headrest that relies on a mechanical interaction between component parts to cushion an occupant's head and prevent whiplash in the event of an automobile collision. However, in view of the art considered as a whole at the time the present invention was made, it was not obvious to those of ordinary skill in the field of this invention how the shortcomings of the prior art could be overcome.

BRIEF SUMMARY OF THE INVENTION

The long-standing but heretofore unfulfilled need for a mechanical reduced-impact-and-recoil headrest that cushions a vehicle occupant's head and neck and minimizes recoil via a ratchet mechanism, thereby decreasing the impact felt by the occupant, is now met by a new, useful, and nonobvious invention.

The novel structure includes a housing having one or more exterior walls and adapted to be installed within a vehicle having a longitudinal axis from a front bumper to a rear bumper, and a lateral axis from a driver side to a passenger side. The housing includes an interior compartment disposed therein, with a first and second lateral interior surface disposed within the interior compartment. Each lateral interior surface is disposed adjacent to one of the side walls. The interior compartment also includes a bracket having a pair of opposing lateral contacting surfaces that are in mechanical communication with the first and second lateral interior surfaces. The lateral contacting surfaces, which may be ratcheting surfaces, are tapered extensions on the bracket; similarly, the lateral interior surfaces, which may be ratchet walls, include tapered cutouts to receive the tapered extensions, such that the lateral contacting surfaces are complementary and achiral to the lateral interior surfaces. In addition, a biasing member forces at least one of the lateral contacting surfaces and at least one of the lateral interior surfaces into contact with each other. As such, the ratchet mechanism formed by the lateral interior surfaces and the lateral contacting surfaces prevents the reduced-impact-and-recoil headrest from automatically returning to its pre-impact position, which reduces the occupant's risk of TBIs, such as whiplash.

In an embodiment, an interior proximal wall is disposed within the interior compartment and adjacent to an exterior proximal wall of the housing. The exterior proximal wall and the interior proximal wall may be made of deformable materials, allowing the walls to deform toward a distal wall during an impact. During the impact, the interior proximal wall is configured to receive the partially deformed exterior wall, and to translate along the longitudinal axis of the vehicle toward the distal wall. The exterior proximal wall and the interior proximal wall are thereby adapted to cushion a vehicle occupant's head and neck during a collision as the reduced-impact-and-recoil headrest absorbs a portion of the kinetic energy of the impact, helping to reduce the risk and severity TBIs.

In an embodiment, the bracket is stationary with respect to the housing, with the housing being capable of translating toward and away from the bracket along the longitudinal axis of the vehicle. The bracket includes a pair of stalks that extend in a direction away from the housing. The stalks are adapted to be received by a pair of complementary apertures disposed in an upper surface of a vehicle seat, allowing the bracket to be secured against the vehicle seat.

The biasing member may be one or more springs that mechanically couple at least one of the lateral interior surfaces with a side wall of the housing, such as a driver-side-facing wall or a passenger-side-facing-wall. During transition between a pre-impact configuration and a post-impact configuration, the lateral interior walls are adapted to translate along the lateral axis of the vehicle toward respective side walls by compressing the one or more springs. The compression of the one or more springs allows the lateral interior walls to traverse between engagement surfaces on the lateral contacting surfaces, thereby incrementally translating the reduced-impact-and-recoil headrest toward the bracket. One or more reset tabs may be disposed on the housing and mechanically coupled to the lateral interior walls. The reset tabs are adapted to at least partially compress the one or more springs, thereby retracting one or more of the lateral interior walls toward the side walls, allowing the housing to be translated with respect to the bracket along the longitudinal axis of the vehicle.

An object of the invention is to provide a ratchet mechanism that decreases the risk and impact of a traumatic brain injury and minimizes the recoil of an occupant's head, thereby preventing whiplash in the event of a vehicle collision, without relying on sensors or other electrical components.

These and other important objects, advantages, and features of the invention will become clear as this disclosure proceeds.

The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts that will be exemplified in the disclosure set forth hereinafter and the scope of the invention will be indicated in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

For a fuller understanding of the invention, reference should be made to the following detailed description, taken in connection with the accompanying drawings, in which:

FIG. 1A is a perspective view of a reduced-impact-and-recoil headrest.

FIG. 1B is a proximal side view of a reduced-impact-and-recoil headrest.

FIG. 2 is a cross-sectional view of a reduced-impact-and-recoil headrest with a stationary housing along section line A-A of FIG. 1B.

FIG. 3A is a cross-sectional view of a reduced-impact-and-recoil headrest with a nonstationary housing in a pre-impact configuration.

FIG. 3B is a cross-sectional view of a reduced-impact-and-recoil headrest with a nonstationary housing in a post-impact configuration.

FIG. 3C is a cross-sectional view of a reduced-impact-and-recoil headrest with a nonstationary housing and a solid set of walls.

DETAILED DESCRIPTION OF THE INVENTION

In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part thereof, and within which are shown by way of illustration specific embodiments by which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the invention.

As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term “or” is generally employed in its sense including “and/or” unless the context clearly dictates otherwise.

In a two-car collision, one car transfers kinetic energy to the other car, thereby exerting a force on the occupants of each car. For example, if a moving vehicle strikes a stationary vehicle from behind, the moving vehicle transfers kinetic energy to the stationary vehicle. As the stationary vehicle gains the kinetic energy transferred by the moving vehicle, the stationary vehicle translates away from the point of impact. While this happens, an occupant within the stationary vehicle translates toward the point of impact as a result of the impact's force. After the previously-stationary vehicle comes to rest, the occupant typically translates away from the point of impact, toward his or her initial position. As a result, a rear-end collision typically results in the occupant's head impacting a headrest before returning to an initial position. Similarly, a front-end collision results in the occupant's head translating toward a windshield before translating back toward the headrest. In either collision, there is a risk that the occupant's head contacts the headrest at some point during the collision. If the headrest is unmovable, the occupant can experience a traumatic brain injury from striking the headrest with a force.

The present invention includes a reduced-impact-and-recoil headrest including complementary components adapted to translate upon impact via a ratchet mechanism. The ratchet mechanism is adapted to cushion a vehicle occupant's head during a collision, as well as minimize recoil to prevent whiplash. The reduced-impact-and-recoil headrest includes a housing and a bracket disposed within the housing. The bracket and the housing each include complementary surfaces configured to form a part of the ratchet mechanism. During an impact, either the housing or the bracket translates with respect to the other component, allowing the occupant's head and neck to be cushioned from the full force of the impact. In addition, the opposing surfaces of the ratchet mechanism prevent the translatable component from recoiling toward an initial position, thereby minimizing the risk of the occupant experiencing whiplash.

As shown in FIGS. 1A and 1B, reduced-impact-and-recoil headrest 1 includes one or more exterior walls, such as proximal wall 2 opposite distal wall 3. Side walls 4 a, 4 b mechanically couple to proximal wall 2 and distal wall 3. Side walls 4 a, 4 b may be referred to as a driver-side-facing wall and a passenger-side-facing wall, depending on the orientation of reduced-impact-and-recoil headrest 1 within a vehicle Reduced-impact-and-recoil headrest 1 includes stalks 5 a, 5 b, which extend downward and away from headrest 1. Stalks 5 a, 5 b are adapted to be received by a pair of complementary apertures disposed on the upper surface of a seat within a vehicle, similar to prior art headrests. When reduced-impact-and-recoil headrest 1 is installed in the vehicle via stalks 5 a, 5 b, proximal wall 2 is adapted to face a front windshield of the vehicle, thereby being disposed to receive an occupant's head.

As shown in FIG. 2, the one or more exterior walls of reduced-impact-and-recoil headrest 1 forms a housing. During a collision or other impact, when kinetic energy is transferred between vehicles involved in the collision, the occupants of the vehicles often contact headrests with a force determined by the transferred energy. As such, proximal wall 2 is adapted to translate toward distal wall 3 when proximal wall 2 receives a vehicle occupant's head, due to the force exerted on proximal wall 2 by the occupant. The housing is adapted to be installed within a vehicle via stalks 5 a, 5 b, as described above. Alternatively, the housing could include apertures in place of stalks 5 a, 5 b, to retrofit the housing onto pre-existing stalks on a vehicle seat.

Referring now to FIGS. 2-3B, the housing includes interior compartment 6 disposed therein. Interior compartment 6 is partially defined by first lateral interior wall 7 a, which may be referred to as ratchet wall 7 a, and second lateral interior wall 7 b, which may be referred to as ratchet wall 7 b (first and second ratchet walls 7 a, 7 b may be referred to collectively as ratchet walls 7). Ratchet walls 7 are defined by a plurality of tapered cutouts that are acute with respect to a lateral axis of reduced-impact-and-recoil headrest 1. The lateral axis spans from proximal wall 2 to distal wall 3. Each tapered cutout provides a downward slope from proximal wall 2 to distal wall 3, the slopes extending away from side walls 4 a, 4 b.

Bracket 8 is disposed within interior compartment 6, and includes first and second lateral contacting surfaces 9 a, 9 b, which may be referred to as ratcheting surfaces 9 a, 9 b (collectively referred to as ratcheting surfaces 9). Each of ratcheting surfaces 9 a, 9 b are defined by a plurality of tapered extensions from opposing sides of bracket 8. The tapered extensions thereby extend toward side walls 4 a, 4 b, and are achiral with respect to ratchet walls 7. Because ratcheting surfaces 9 and ratchet walls 7 are achiral with respect to each other, the tapered extensions of ratcheting surfaces 9 can be received by the tapered cutouts of ratchet walls 7, forming a rectangular shape. Accordingly, ratcheting surfaces 9 can be described as being complementary to ratchet walls 7. While the cutouts and extensions are described as being tapered, it is contemplated that a similar ratchet mechanism can be accomplish through polygonal cutouts and extensions, so long as the extensions require a force to translate to different cutouts, and vice versa.

Moreover, the achiral relationship between ratcheting surfaces 9 and ratchet walls 7 allows bracket 8 to translate toward distal wall 3 along the individual tapered cutouts of ratchet walls 7. The ratchet mechanism, which includes ratcheting surfaces 9 and ratchet walls 7, thereby allows ratcheting surfaces 9 to rest on ratchet walls 7 in a pre-impact configuration, and slide down the tapered cutouts after a force is exerted against proximal wall 2. As such, the ratchet mechanism allows proximal wall 2 to translate toward distal wall 3. Since ratcheting surfaces 9 travel down the slopes created by the tapered cutouts of ratchet walls 7, the friction between ratcheting surfaces 9 and ratchet walls 7 slow the translation of bracket 8 toward distal wall 3. As a result of the interaction between bracket 8 and ratchet walls 7, and the friction between the surfaces during translation, reduced-impact-and-recoil headrest is adapted to dampen the force of the impact on the occupant's head and neck. In addition, ratcheting surfaces 9 cannot travel back toward the front end of the vehicle due to the slopes of ratchet walls 7, which thereby minimizes the occupant's risk of whiplash caused by the occupant's head and neck recoiling back toward the front of the vehicle post-collision.

As seen in FIG. 2, bracket 8 includes two halves, 8 a and 8 b, that are joined together via spring 13, which is a biasing member. Half 8 a includes ratcheting surface 9 a, and half 8 b includes ratcheting surface 9 b, with ratcheting surfaces 9 a, 9 b adapted to incrementally translate along first and second ratchet walls 7 a, 7 b. Spring 13 allows halves 8 a, 8 b to translate toward and away from each other along the lateral axis of a vehicle from driver side to passenger side. In addition, spring 13, as a biasing member, forces at least one of ratcheting surfaces 9 a, 9 b and at least one of ratchet walls 7 a, 7 b into contact with each other.

During an impact, a portion of the kinetic energy of the impact is transferred to bracket 8, which causes bracket 8 to translate toward distal wall 3. Because ratcheting surfaces 9 a, 9 b are mechanically coupled to first and second ratchet walls 7 a, 7 b, some of the kinetic energy is lost due to the friction between surfaces 9 a, 9 b and walls 7 a, 7 b, as discussed above. As bracket 8 translates along ratchet walls 7, the tapered extensions of ratcheting surfaces 9 a, 9 b must translate to a different tapered cutout on first and second ratchet walls 7 a, 7 b, in order to allow bracket 8 to continue its translation toward distal wall 3. The kinetic energy of the impact thereby causes spring 13 to compress, which allows halves 8 a, 8 b to translate toward each other along the longitudinal axis of reduced-impact-and-recoil headrest 1, as ratcheting surfaces 9 travel down ratchet walls 7. In this orientation, the housing is stationary via the attachment of stalks 5 a, 5 b to a vehicle's seat, and bracket 8 translates with respect to the housing.

Referring again to FIG. 2, the housing includes interior proximal wall 11 disposed within interior compartment 6 and adjacent to proximal wall 2. Interior proximal wall 11 includes two halves 11 a, 11 b, which are hingedly coupled via hinge 12. As shown in FIG. 2, interior proximal wall 11 is sized to span from ratchet wall 7 a to ratchet wall 7 b, but is not long enough to allow halves 11 a, 11 b to rest on the tapered cutouts of ratchet wall 7 a, 7 b. As such, halves 11 a, 11 b will not catch on ratchet walls 7 a, 7 b, allowing internal proximal wall 11 to smoothly and continuously translate toward distal wall 3 without prematurely stopping due to frictional forces, which could cause whiplash or other similar injuries to an occupant.

Because interior proximal wall 11 includes hinge 12, interior proximal wall 11 is configured to deform about hinge 12 during an impact. When proximal wall 2 deforms as a result of the force exerted by the occupant's head, proximal wall 2 contacts interior proximal wall 11. Proximal wall 2 then transfers kinetic energy to interior proximal wall 11, thereby forcing interior proximal wall 11 toward distal wall 3. Because interior proximal wall 11 includes halves 11 a, 11 b, which are adapted to rest on ratchet walls 7 a, 7 b in a pre-impact configuration, interior proximal wall deforms about hinge 12 during the impact. The deformation occurs because halves 11 a, 11 b are initially retained by ratchet walls 7 a, 7 b, and the force of the occupant's head causes hinge 12 to translate along the lateral axis of reduced-impact-and-recoil headrest 1 toward distal wall 3. A result of the translation of hinge 12 is that half 11 a radially translates in a counterclockwise direction about hinge 12, since half 11 a remains connected to ratchet wall 7 a. Similarly, half 11 b radially translates in a clockwise direction about hinge 12, since half 11 b remains connected to ratchet wall 7 b. As hinge 12 continues to translate toward distal wall 3, the angle defined by hinge 12 with respect to the longitudinal axis of reduced-impact-and-recoil headrest becomes greater than the angle of ratchet walls 7. As a result, halves 11 a, 11 b travel down ratchet walls 7, similar to the translation of ratcheting surfaces 9 a, 9 b, above, allowing halves 11 a, 11 b to incrementally translate toward distal wall 3.

Interior proximal wall 11 is in mechanical communication with interior proximal wall 11 via extensions 16. Extensions 16 function similar to spring door stops by being rigid enough to remain stationary during non-impact situations, yet flexible enough to allow bracket halves 8 a, 8 b to translate toward and away from each other during an impact. After the impact is over, and after proximal wall 2 reaches a terminal point, extensions 16 return to the initial rigid state. The flexibility of extensions 16 allows ratcheting surfaces 9 a, 9 b to travel down respective ratchet walls 7 a, 7 b, thereby allowing proximal wall 2, interior proximal wall 11, and bracket 8 to translate toward distal wall 2. In addition, the rigidity of extensions 16 prevent bracket halves 8 a, 8 b from translating toward distal wall 3 without a sufficient force on proximal wall 2.

As shown in FIG. 2, dampening members are disposed within interior compartment 6 to further cushion the occupant's head during an impact. The dampening members are adapted to slow the incremental translation of bracket 8 from proximal wall 2 toward distal wall 3. For example, foam cushion 10 is disposed adjacent to proximal wall 2, between proximal wall 2 and bracket 8. Foam cushion 10 is adapted to absorb part of the impact by slowing the translation of proximal wall 2 and/or interior proximal wall 11 toward distal wall 3. Foam cushion 10 is made of a deformable material, allowing foam cushion 10 to absorb impact, compress, and decompress after the force of the impact has dissipated.

In addition, interior compartment 6 includes receiving platform 14, which is disposed adjacent to distal wall 3. Receiving platform 14 is secured against distal wall 3 via one or more springs 15, which apply a biasing force on receiving platform 14 in a direction toward proximal wall 2. During an impact, when bracket 8 translates toward distal wall 3, receiving platform 14 is adapted to receive bracket 8, preventing bracket 8 from directly contacting distal wall 3. Springs 15 are configured to compress when bracket 8 couples with receiving platform 14, thereby dampening the translation of bracket 8 toward distal wall 3. When the biasing force of springs 15 is of greater magnitude than the force of the impact, springs 15 are adapted to decompress, thereby translating receiving platform 14 in a direction toward proximal wall 2. Receiving platform 14 can thereby translate bracket 8 in a direction toward proximal wall 2 to a final, resting, post-impact position. Receiving platform 14 can also return bracket 8 to its initial, pre-impact position, depending on the length of springs 15.

Turning now to FIG. 3A, an embodiment of reduced-impact-and-recoil headrest 1 includes a stationary bracket 8 and a translatable housing. Bracket 8 is installed in a vehicle seat via stalks 5 a, 5 b, anchoring bracket 8 within a pair of complementary apertures disposed in an upper surface of the vehicle seat. In this configuration, the housing is adapted to translate with respect to bracket 8. For example, during an impact, proximal wall 2 is adapted to incrementally translate along a lateral axis of reduced-impact-and-recoil headrest 1 toward distal wall 2, via a ratchet mechanism similar to the mechanism described in detail above.

As shown in FIG. 3A, proximal wall 2 is discontinuous and includes first member 20 a and second member 20 b. First and second members 20 a and 20 b are adapted to pivot about hinges 21 a, 21 b, respectively. Hinges 21 a, 21 b allow first and second members 20 a, 20 b to radially translate toward interior compartment 6 during an impact, when an occupant's head transfers kinetic energy to reduced-impact-and-recoil headrest 1. Specifically, first member 20 a is adapted to radially translate in a counterclockwise direction, and second member 20 b is adapted to radially translate in a clockwise direction, both translating toward interior compartment 6.

Interior proximal wall 11 is disposed within interior compartment 6, and is sized to span from ratchet wall 7 a to ratchet wall 7 b, with halves 11 a, 11 b resting on respective ratchet walls 7 a, 7 b. Because the housing translates in this embodiment, halves 11 a, 11 b are adapted to mechanically connect with ratchet walls 7 a, 7 b, with the frictional forces between the components aiding in translating the housing with respect to bracket 8. In addition, halves 11 a, 11 b are hingedly coupled to each other via hinge 12. As discussed above, interior proximal wall 11 is thereby configured to translate along the lateral axis of reduced-impact-and-recoil headrest 1 toward distal wall 3 during an impact, with the translation occurring incrementally via the interaction between interior proximal wall 11 and ratchet walls 7 a, 7 b.

In this embodiment, each half 11 a, 11 b of interior proximal wall 11 is translated upon receiving respective members 20 a, 20 b of proximal wall 2. In particular, when first and second members 20 a, 20 b of proximal wall 2 radially translate toward interior compartment 6, interior proximal wall halves 11 a, 11 b are adapted to receive respective first and second members 20 a, 20 b. After receiving members 20 a, 20 b, interior proximal wall 11 is adapted to deform about hinge 12 and translate along the lateral axis of reduced-impact-and-recoil headrest 1 via the ratchet mechanism discussed above. Since halves 11 a, 11 b rest on the tapered cutouts of respective ratchet walls 7 a, 7 b, interior proximal wall 11 is thereby adapted to pull the housing toward bracket 8 upon an impact as a result of the mechanical connection. Accordingly, during an impact, both exterior proximal wall 2 and interior proximal wall 11 are configured to deform and translate in a direction toward distal wall 3.

First and second ratchet walls 7 a, 7 b are mechanically coupled to side walls 4 a, 4 b, respectively. Specifically, first ratchet wall 7 a is coupled to side wall 4 a via springs 17 a, and second ratchet wall 7 b is coupled to side wall 4 b via springs 17 b. Each of springs 17 a, 17 b are biasing members that apply a biasing force toward the opposite spring (i.e., spring 17 a applies a biasing force toward spring 17 b, and vice versa). As biasing members, springs 17 a, 17 b force at least one of the ratchet walls 7 a, 7 b into contact with at least one of the ratcheting surfaces 9 a, 9 b. Springs 17 a, 17 b are also adapted to compress toward respective side walls 4 a, 4 b if ratchet walls 7 a, 7 b experience a force of a greater magnitude than that of the biasing forces, such as the force of an impact caused by a collision.

As noted above, bracket 8 is stationary in the embodiment of FIG. 3A. Accordingly, the housing translates about bracket 8 in this embodiment. As such, during an impact, proximal wall 2 and distal wall 3 remain oriented substantially parallel to each other and to the longitudinal axis of reduced-impact-and-recoil headrest 1, while members 20 a, 20 b mechanically coupled to proximal wall 2 translate toward interior compartment 6. Moreover, because bracket 8 includes ratcheting surfaces 9 a, 9 b, which are defined by a plurality of tapered extensions, the housing incrementally translates along ratcheting surfaces 9 a, 9 b via first and second ratchet walls 7 a, 7 b according to the ratchet mechanism described above.

During the translation, the kinetic energy of the impact is transferred to the housing, which then translates with respect to stationary bracket 8. The impact force is greater than the lateral component of the forces of springs 17 a, 17 b, which allows housing to laterally translate. However, since ratchet walls 7 a, 7 b are mechanically coupled to ratcheting surfaces 9 a, 9 b, springs 17 a, 17 b must be partially compressed in a longitudinal direction to allow the housing to laterally translate. Springs 17 a, 17 b are longitudinally compressed as a result of the mass of bracket 8 that is mechanically coupled to a vehicle seat. Because bracket 8 is stationary, a portion of the kinetic energy from the impact is transferred to ratchet walls 7 a, 7 b, which thereby partially compresses springs 17 a, 17 b. When springs 17 a, 17 b compress, and ratchet walls 7 a, 7 b longitudinally translate toward respective side walls 4 a, 4 b, the housing can incrementally translate toward bracket 8. The interaction between ratchet walls 7 a, 7 b and ratcheting surfaces 9 a, 9 b results in friction that slows the lateral translation of the housing.

The housing includes reset tabs 22 a, 22 b disposed on opposite side walls 4 a, 4 b of the housing. Reset tabs 22 a, 22 b act as a placement mechanism for the housing, allowing a user to position the housing at desired locations. Reset tabs 22 a, 22 b are adapted to be pulled away from side walls 4 a, 4 b of the housing along the lateral axis of the vehicle, which allows the housing to be positioned. Reset tabs 22 a, 22 b allow such positioning by being mechanically coupled to springs 17 a, 17 b, respectively. An example of a mechanical coupling is a hook coupled to both reset tab 22 a and one of the springs 17 a, such that when reset tab 22 a is longitudinally pulled away from side wall 4 a, one of springs 17 a is partially compressed. As a result of the compression, ratchet wall 7 a is longitudinally translated away from bracket 8, thereby partially detaching the housing from bracket 8. The detachment allows the housing to be translated to a different position with respect to bracket 8. When a user discontinues applying a pulling force on reset tab 22 a, the partially compressed spring 17 a decompresses, allowing ratchet wall 7 a to mechanically couple with bracket 8. Accordingly, a user could use reset tabs 22 a, 22 b to select a comfortable position for the housing, such that the user's head is received by proximal wall 2. In addition, reset tabs 22 a, 22 b can be used to reposition the housing after an impact causes the housing to translate toward bracket 8.

Turning now to FIG. 3B, the housing is shown in a post-impact configuration. In the post-impact configuration, members 20 a, 20 b of proximal wall 2 radially translate about hinges 21 a, 21 b toward bracket 8. As such, proximal wall 2 is adapted to provide a comfortable resting place for a vehicle occupant's head by deforming and separating members 20 a, 20 b from one another. Proximal wall 2 thereby reduces the impact felt by the occupant, in part by providing a space for the occupant's head to be received during a collision. Similarly, interior proximal wall halves 11 a, 11 b deform about hinge 12, such that hinge 12 translates toward bracket 8.

The components within internal compartment 6 function to slow the translation of the occupant's head toward distal wall 3, and to prevent the occupant's head from quickly translating toward a front end of a vehicle after a collision, thereby reducing the risk of whiplash. For example, foam cushion 10 is disposed between proximal wall 2 and bracket 8 to slow the translation of reduced-impact-and-recoil headrest 1 toward bracket 8. Foam cushion 10 reduces part of the impact force by absorbing a portion of the kinetic energy from the translation of reduced-impact-and-recoil headrest 1. As such, foam cushion 10 slows the translation of reduced-impact-and-recoil headrest 1 toward bracket 8. In addition, the complementary tapers formed by the interaction between ratchet walls 7 a, 7 b and ratcheting surfaces 9 a, 9 b convert a portion of the kinetic energy from the collision into friction energy, thereby slowing reduced-impact-and-recoil headrest 1 as ratchet walls 7 a, 7 b slide down ratcheting surfaces 9 a, 9 b. Moreover, the tapers prevent reduced-impact-and-recoil headrest 1 from automatically translating back to its pre-impact position, reducing the occupant's risk of whiplash. After the collision, reduced-impact-and-recoil headrest 1 can be repositioned via reset tabs 22 a, 22 b, as discussed above.

FIG. 3C shows an alternative embodiment of reduced-impact-and-recoil headrest 1 having a continuous and singular proximal wall 2, as well as the ratchet mechanism discussed in detail above. Reduced-impact-and-recoil headrest 1 may be disposed within a cushioned headrest casing, such that reduced-impact-and-recoil headrest 1 is surrounded by cushioning material adapted to provide a surface for an occupant's head. As such, reduced-impact-and-recoil headrest 1 is adapted to translate when impacted by the cushioned casing during a collision. Specifically, reduced-impact-and-recoil headrest 1 translates along the longitudinal axis of the vehicle and toward bracket 8, such that in a post-impact configuration, proximal wall 2 is disposed substantially adjacent to bracket 8. As discussed in detail above, the ratchet mechanism reduces the impact of a collision experienced by an occupant, as well as prevents the translation of reduced-impact-and-recoil headrest 1 toward the front end of the vehicle, thereby minimizing the risk of the occupant experiencing whiplash.

GLOSSARY OF CLAIM TERMS

Biasing Member: is a device adapted to rebound back to a position of repose when it is no longer subject to an external force.

Deformable: flexible material that is capable of being altered in shape due to a received force.

Housing: is a casing defining an interior compartment and including a bracket and ratchet mechanism.

Lateral Axis: extending from a driver side of a vehicle to a passenger side of the vehicle.

Lateral Contacting Surface: is a first component of a ratchet mechanism, in mechanical communication with a bracket and adapted to interact with a lateral interior surface. An example of a lateral contacting surface is a ratcheting surface disposed on the bracket.

Lateral Interior Surface: is a second component of a ratchet mechanism, in mechanical communication with a bracket and adapted to interact with a lateral contacting surface. An example of a lateral interior surface is a ratchet wall within the housing.

Longitudinal Axis: extending from a front bumper of a vehicle to a rear bumper of the vehicle.

Post-Impact Configuration: is a configuration of a reduced-impact-and-recoil headrest, particularly referring to the spatial relationship between a bracket and a housing, prior to a collision.

Pre-Impact Configuration: is a configuration of a reduced-impact-and-recoil headrest, particularly referring to the spatial relationship between a bracket and a housing, after a collision.

Ratchet Mechanism: is a system including a first and a second component, wherein one of the two components can incrementally translate with respect to the other component.

Stalk: is a member that extends in a direction away from a housing that is designed to be received by an aperture to anchor the housing within a vehicle seat.

REFERENCES

[1] National Safety Council. Everyone Has a Role in Making Our Roads Safer. Dec. 14, 2017.

All referenced publications are incorporated herein by reference in their entirety. Furthermore, where a definition or use of a term in a reference, which is incorporated by reference herein, is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.

While certain aspects of conventional technologies have been discussed to facilitate disclosure of the invention, Applicant in no way disclaims these technical aspects, and it is contemplated that the claimed invention may encompass one or more of the conventional technical aspects discussed herein.

The present invention may address one or more of the problems and deficiencies of the prior art discussed above. However, it is contemplated that the invention may prove useful in addressing other problems and deficiencies in a number of technical areas. Therefore, the claimed invention should not necessarily be construed as limited to addressing any of the particular problems or deficiencies discussed herein.

In this specification, where a document, act or item of knowledge is referred to or discussed, this reference or discussion is not an admission that the document, act or item of knowledge or any combination thereof was at the priority date, publicly available, known to the public, part of common general knowledge, or otherwise constitutes prior art under the applicable statutory provisions; or is known to be relevant to an attempt to solve any problem with which this specification is concerned.

The advantages set forth above, and those made apparent from the foregoing description, are efficiently attained. Since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matters contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention that, as a matter of language, might be said to fall therebetween. 

What is claimed is:
 1. A headrest comprising: a housing having one or more exterior walls defining an interior compartment, with a first and a second ratchet wall disposed on opposing sides of the interior compartment, the housing adapted to be installed within a vehicle having a longitudinal axis from a front bumper to a rear bumper, and a lateral axis from a driver side to a passenger side; a bracket disposed within the interior compartment and including: a first ratcheting surface configured to engage the first ratchet wall of the housing and prevent the relative movement of the housing and the bracket in the longitudinal direction when the first ratcheting surface and the first ratchet wall contact each other; and a second ratcheting surface configured to engage the second ratchet wall of the housing and prevent the relative movement of the housing and the bracket in the longitudinal direction when the second ratcheting surface and the second ratchet wall contact each other; and a biasing member forcing at least one of the first and second ratcheting surfaces of the bracket and at least one of the first and second ratchet walls of the housing into contact with each other.
 2. The headrest of claim 1, wherein: the housing includes a front-bumper-facing wall and a rear-bumper-facing wall, the front-bumper-facing wall adapted to be disposed between the rear-bumper-facing wall and the front bumper of the vehicle; wherein the bracket is configured to be adjacent to the front-bumper-facing wall of the housing in a pre-impact configuration, and incrementally translated along the lateral axis toward the rear-bumper-facing wall in a post-impact configuration via a mechanical interaction between the ratcheting surfaces and the ratchet walls.
 3. The headrest of claim 1, wherein: the ratcheting surfaces are tapered extensions on the bracket, and the ratchet walls are tapered cutouts of the housing, the ratcheting surfaces being complementary and achiral to the ratchet walls.
 4. The headrest of claim 1, wherein: the biasing member is one or more springs mechanically coupling at least one of the first and second ratchet walls to at least one of a driver-side-facing wall of the housing and a passenger-side-facing wall of the housing, the spring forcing at least one of the first and second ratchet walls into contact with at least one of the first and second ratcheting surfaces.
 5. The headrest of claim 4, further comprising: at least one reset tab disposed on at least one of the driver-side-facing wall and the passenger-side-facing wall of the housing, the at least one reset tab mechanically coupled to at least one of the first and second ratchet walls, the reset tab adapted to at least partially compress the one or more springs, thereby retracting the at least one of the first and second ratchet walls toward the at least one of the driver-side-facing wall and the passenger-side-facing wall of the housing, such that the housing can be translated with respect to the bracket along the longitudinal axis of the vehicle.
 6. The headrest of claim 1, further comprising: a pair of stalks extending away from the housing, the stalks adapted to be received by a pair of complementary apertures disposed on an upper surface of a vehicle seat.
 7. A headrest comprising: a housing having a plurality of walls including a proximal wall opposite a distal wall and a pair of opposing side walls, the plurality of walls defining an interior compartment, with a first and a second ratchet wall disposed on opposing sides of the interior compartment and proximate to the opposing side walls, the housing adapted to be installed within a vehicle having a longitudinal axis from a front bumper to a rear bumper, and a lateral axis from a driver side to a passenger side, the proximal and distal walls oriented along the lateral axis, and the side walls oriented along the longitudinal axis; a bracket disposed within the interior compartment, the bracket being stationary with respect to the housing and including: a first ratcheting surface configured to engage the first ratchet wall of the housing and prevent the relative movement of the housing and the bracket in the longitudinal direction when the first ratcheting surface and the first ratchet wall contact each other; and a second ratcheting surface configured to engage the second ratchet wall of the housing and prevent the relative movement of the housing and the bracket in the longitudinal direction when the second ratcheting surface and the second ratchet wall contact each other; a biasing member forcing at least one of the first and second ratcheting surfaces of the bracket and at least one of the first and second ratchet walls of the housing into contact with each other; and a pair of stalks extending away from the housing, the stalks adapted to be received by a pair of complementary apertures disposed on an upper surface of a vehicle seat.
 8. The headrest of claim 7, wherein: the biasing member is one or more springs mechanically coupling at least one of the first and second ratchet walls to at least one of the side walls of the housing, the one or more springs forcing at least one of the first and second ratchet walls into contact with at least one of the first and second ratcheting surfaces.
 9. The headrest of claim 8, wherein: during transition between a pre-impact configuration and a post-impact configuration, the first and second ratchet walls are adapted to translate along the lateral axis toward respective side walls by compressing the one or more springs, such that the first and second ratchet walls can traverse between engagement surfaces on the first and second ratcheting surfaces, thereby incrementally translating the reduced-impact-and-recoil headrest along the longitudinal axis toward the bracket. 